CHAPTER IL 



GEOLOGY OF THE COOS AND ESSEX TOPOGRAPHICAL DISTRICT. 



BY J. H. HUNTINGTON. 



Introduction. 



The geology of the country here noted embraces the northern part of New Hamp- 

 shire as far south as the White Mountain region, and we have also included parts of 

 Canada and Vermont that are adjacent. 



The topography of this section has been briefly sketched in Part I, Chapter VIII, of 

 this report. 



We have described the rocks as belonging to certain groups, — the Coos, Huronian, 

 and Montalban. 



As there are the same general reasons for assigning the rocks in this section to these 

 groups as for placing similar rocks elsewhere in the state in them, to show the reason 

 why they are so placed would be only a repetition of what has been said ; for we see 

 no reason, with our present knowledge, for disagreeing with the general conclusions 

 reached by the state geologist. So far as tracing the boundaries between the different 

 groups is concerned, and making minor subdivisions, the writer is alone responsible. 



The general scheme of this report is as follows : 



(i) There is given a general outline of each of the groups, with their geographical 

 limits. 



(2) We have given the locality where the rocks have been examined and specimens 

 have been obtained, with the dip of the strata. 



(3) There will be found a catalogue of the specimens, as arranged in the state mu- 

 seum at the New Hampshire College of Agriculture and the Mechanic Arts. 



By this arrangement, a person who desires only a general knowledge of the geology 

 of this section, can obtain that from the outline. A study of the dips will give a person 



